Air-pump



c, c. HANGER. AIR PUMP.

APEUCATION FILED APR. 28. 1919.

1,332,293. I Patented Mar. 2, 1920.

avwzuboz UNITED STATES PATENT OFFICE.

COURTNEY C. HANGER, OF MADISONVILLE, KENTUCKY, ASSIGNOR OF ONE-FOURTH TO W. D. COIL, OF MADISONVILLE, KENTUCKY.

AIR-PUMP.

Specification of Letters Patent.

Patented Mar. 2, 1920.

Application filed April 28, 1919. Serial No. 293,090.

To all whom it may concern:

Be it known that I, COURTNEY C. HANGER, a citizen of the United States, residing at Madisonville, in the county of Hopkins and State of Kentucky, have invented certain new and useful Improvements in .Air Pumps, of which the following is a specification, reference being had to the accompanying drawings.

This invention relates to double acting pumps, and particularly to a double acting air pump.

The general object of this invention is to provide a very simple and effective pump having a very simple controlling valve controlling the passage of air from the pump and being so constructed that there is no valve necessary in order to control the inlet of air to the pump.

A further object is to provide a construction of this character including a plunger and plunger rod, so constructed that the air is admitted through the plunger or piston rod and through the piston into the barrel of the pump, and particularly so constructed that upon a movement of the piston in one direction, air is admitted through the piston to the space behind the piston, while the air in front of the piston is forced out through the outlet port.

A further object is to provide a pump of this character having few parts, and these are of a very simple construction to thus render the pump less liable to accidental breakage or derangement of the parts and permit a relatively cheap construction of the pump and permit the parts to be readily assembled or disassembled.

Other objects will appear in the course of the following description.

My invention is illustrated in the accompanying drawings, wherein Figure 1 is a longitudinal vertical section of an air pump constructed in accordance with my invention; and

Fig. 2 is an enlarged view of the valve shown in Fig. 1.

Referring to these drawings, 10 designates the barrel or cylinder of the pump which is, of course, of metal and which is eXteriorly screw-threaded at its ends. This barrel or cylinder is mounted upon. a base 11 having a centrally disposed hub 12 interiorly screw-threaded, at 13, for the reception of the lower end of the barrel 10 and also having a screw-threaded .bore 14 and a port or duct 15 extending downward from the interior of the annular hub 12 and extending upward into the bore 1%.

The upper end of the barrel 10 is closed by a metal cap 16 which is interiorly threaded to engage the upper end of the cylinder and which is adapted to bear upon a gasket 17 on the upper end of the cylinder to there by form an air-tight engagement between the cap and the cylinder. The cap is recessed to receive a packing nut 18. The cap extends beyond the cylinder and is formed to provide a valve casing, as will be later described.

Extending through the packing nut 18 is a piston rod or plunger rod 19, which is tubular for nearly its entire length. The bore 20 of this plunger rod extends downward from the outer end of the plunger nearly to the inner end and communicates with a transversely extending bore 21 which opens upon the outer face of the plunger rod. The plunger rod at its upper end is provided with an operating handle 22, held in place by nuts 23 or other suitable means.

Mounted upon the lower end of the plunger rod is a piston or plunger comprising spaced disks 24: within which is disposed a radially grooved packing ring 25 which is arranged between the disks 24 and is spaced from the outer surface of this portion of the plunger rod. The transverse duct or port 21 opens into the space between the disks 2 1 and the packing ring 25. Disposed upon the upper face of the upper disk 24: is a cup 26 of leather, rubber, or other suitable material, the outer edge of which extends upward, as at 27 and bears yieldingly against the inner face of the cylinder 10. This cup is held in place by a metallic disk 28 which is screw-threaded on the plunger rod and above this disk there is disposed the nut 29. Below the lower disk 24 there is disposed a cup of leather, rubber or other suitable flexible material, designated 30, which corresponds in form to the cup 26. This is held in place by a lower disk 31 and a nut 32, as previously described. The disks 24c, 28 and 30 are screw-threaded on the screw-threaded portion of the rod 19.

This construction is such; that when theplunger is forced downward, the pressure of air below the lower cup 30 will cause this cupv to expand and fit against the cylinder walls tightly, while the upper cup is free to contractand permit air from the duct 21 to pass into the upper portion of the cylinder. Upon the upward stroke of the piston, the upper cup26 isexpanded' against the wall of the cylinder, While the lower cup; yields to permit the passage of air from the duct 21 into the lower portiono-f the oylinden,

As beforeremarked, the oap,16': is formed to, provide a valve casing, designated 32; This valvecasingisclosed at its lower.- end by means of a cap,33 having an annular, ex.-

' teriorly sorew-threaded v flange 3%, engaging the interior screw-threads on thewall of: the

, chamber 35.0f the valve casing, thisycap-33 having a centralaperture- A. tube I 36 which haslits upper; end flanged, isinserted through thisapertureinthis cap nut 33. Thelower end ofgthis tube 36 hasscrew-threaded engagementiwith thebase 12. When the-cap nut33 is engaged within the lower end of the valve casing, it is,obviousthat= it will draw the tube; 36 up tightly so. that the upper end of the tube 36will have air-tight engagement with the valve casing.

Extending from the upper. end of the cylinder 10 through the interior of the cap 16- is an air duct 37 which, at its outerend, opens into the upper end of the chamber 85. The shoulder 38 at-this point forms a valve seat. The lower end of the valvecasing is also cformed with a valve seat 39 which is preferably formed by a screw-threaded annulus. an outlet port 40 extending through an interiorly screw-threaded nipple whereby. an outletipipe as, for instance, an outlet pipe of rubber, maybe engaged with the pump Disposed within the chamber 85 are two valvestl and 12. Thevalve 41 coacts with thefseat 89, and the body of this valve-has a downwardly extending stud 43 surrounded by a .gasket 4e adapted to coact with the seat '89.; The body of the valve is longitudinallyvbored,i-as at 45. Thevalve 42 has a i centrally disposed, downwardly extending ent movement.

In the operatlonof this device, assuming thattheplu-nger is at the lower end of the barrel or cylinder 10, thenupon an upward movement of; theplunger, the,cup 26 will The side of the valve casing has hug the cylinder 10 tightly so that the air above the piston will be, forced out through theoutlet port 37 into the chamber 35,.while the air above the piston is being forced out through the outlet port 37. The air passing downward through. the. tubular plungerrod and outthroughmhe port 21 is forced around the cup 30 into the lower portion of the cylinder or barrel. When the air is forced out through the duct 37 and exhausted, the

valve 42 will be forced open and thevalve 41 will beclosed, thus permitting the outward passage of air from the duct 37 through the outlet opening; 40. When the piston or plungenhas reached the endof its, stroke, the motion isreve'rsech so that the air, below; the; plunger is now compressed} and as, a consequence, the cup. 30 is expanded and air is admittedthrough the cup 26- into thespace above the downwardly .111OVP ing plunger. Theipressure-o-f. the air below the piston forced out throughthe; duct 15 and-tube 36, will nowv cause the valve 111 to openand-thesuction in the space above-the piston will cause the valve 42 to; close: Thus, by reciprocating theplungen air will be caused to pass out continuously through the port 40.

It will be seen that urging the valves to their seats,.that[ the this, construction is 1 i valve mechanism cannot readily get" out.of'-- order, and that it isv-an easy, matter/to: dis; engage the cap .33 and the seat 59 to thereby remove, replace,.and repair the valves 41' and 12, and thatitis an easy; matter-toremove the cap 16 inorder to'srearrangeor larly effective: in practice; yet a it.- isv-obvious.

that many changesmight be madinthedetails of construction, and, arrangement. of parts A without departing. from. the spirit ofv the invention...

I claim 1.. A pump of the character described 1 comprising a barrel anda' valveschamber.

having ducts extendinghfrom itsopposite' ends into opposite ends of the barrel, adom ble acting piston operating. within: the .bar

rel and constructed (tocauseMthe-entrance of a r to one end of the barrel and-Ithe :expuL 1011 ofvairithroughtheduct atthe other end of the" barrel, said valve chamber having an outlet port andoppositely-disposedvalveseats, and valvesboth' disposed in said chamher and each,v controlling the. passage of air through one of said ports, said valveszbeind independently J movable, and being .shifte to their respective closed and open positions by suction and pressure of air.

A pump of the character described comprising a barrel, a tubular piston rod extending into the barrel and having a lateral port at its inner end, a piston including flexible cups disposed above and below said port, the cups extending in reverse directions into the barrel and coacting with the same whereby upon a movement of the piston in opposite directions the cups will alternately be forced against the barrel and forced away from the barrel by the inlet of air, the ends of the barrel being formed with outlet ducts, a valve chamber, said valve chamber having an outlet port being formed to provide seats at opposite ends of the valve chamber, a longitudinally shiftable valve coacting with one of said seats and having a central bore, and a longitudinally shiftable valve coactin'g with the other seat and having a stem extending into said bore, said valves being independently and freely movable within the valve chamber toward or from the seats.

3. A pump of the character described including a pump barrel and a single valve chamber having ducts extending from its opposite ends into opposite ends of the pump barrel, a piston operating within the pump barrel and constructed to cause air to be forced out through one of said ducts as the piston moves in one direction and draw air into the barrel behind the piston, the valve chamber having oppositely disposed valve seats and an outlet port, and independently shiftable valves disposed within said chamher and each controlling passage through one of said ducts, one of said valves having a stem extending loosely into the other of said valves whereby said valves will telescopically engage with each other.

4:. A pump of the character described including a barrel having a base at one end upon which the barrel is mounted, a cap closing the opposite end of the barrel and formed to provide a valve chamber exteriorly of the barrel, a tubular plunger rod passing through said cap and open at its outer end, the inner end of the piston rod having laterally disposed ports communicating with the interior of the cylinder, a piston mounted noon the inner end of the piston rod and including two flexible cups disposed on opposite sides of said ducts and having their margins extending in opposite directions and loosely bearing against the interior face of the cylinder, the base being formed to provide a duct leading from the lower end of the cylinder, a tube connecting this last named duct to one end of the valve chamber, the cap at the opposite end of the cylinder being provided with a duct leading into the adjacent end of the valve chamber, and two independently movable valves disposed within the valve chamber, one controlling the passage of air from the first named duct and the other controlling the passage of air from the second named duct, one of said valves having a central bore and the other valve having a stem having sliding engagement with the bore, the valve chamber being provided With an outlet port.

5. A pump of the character described including a barrel having a base at one end upon which the barrel is mounted, a cap closing the opposite end of the barrel and formed to provide a valve chamber exteriorly of the barrel, a tubular plunger rod passing through said cap and open at its outer end, the inner end of the piston rod having laterally disposed ports communicating with the interior of the cylinder, a piston mounted upon the inner end of the piston rod and including two flexible cups disposed on opposite sides of said ducts and having their margins extendin in opposite directions and looselv bearing against the interior face of the cylinder, a tube connecting this last named duct to one end of the valve chamber the cap being formed to provide a duct leading into the upper end of the valve chamber, and the valve chamber being formed to provide a seat at the termination of this duct, the opposite end of the valve chamber being formed to provide a seat, and the valve chamber between ,these seats having an outlet port, and independently movable valves disposed within the chamber, one of said valves having a stem extending through the last named seat and having a longitudinally extending bore, the other valve having a stem extending into said bore and a stem extending into the duct in the cap.

6. A pump of the character described in cluding a barrel having a base at one end upon which the barrel is mounted, a cap closing the opposite end of the barrel and formed to provide a valve chamber exteriorly of the barrel, a tubular plunger rod passing through said cap and open at its outer end, the inner end of the piston rod having laterally disposed ports communicating with the interior of the cylinder, a piston mounted upon the inner end of the piston rod and including two flexible cups disposed on opposite sides of said ducts and having their margins extending in opposite directions and loosely bearing against the interior face of the cylinder, a tube connecting this last named duct to one end of the valve chamber, the cap having screwthreaded engagement with this end of the valve chamber and having a central opening through which the tube passes, the extremity, of the tube being flanged to engage the cap, the cap at the opposite end of the cylinder being provided with a duct leading 

